Given that radical chlorination of (R)-2-chloropentane yields 2,4-dichloropentane in low yield. The number of stereoisomers formed, in what ratio and which of them are optically active are to be stated. Concept introduction: Whenever a new chiral centre is created in an optically active reactant in a reaction, diasteoisomers are produced. These diastereoisomers are usually obtained in unequal proportions as the approach of the reagent from backside is usually hindered. The diastereoisomers will be optically active if they are non superimposable on their mirror images and optically inactive if they are superimposable on their mirror images. To state: The number of stereoisomers formed in the reaction in which radical chlorination of (R)-2-chloropentane yields 2,4-dichloropentane in low yield. The ratio in which they are formed and which of them are optically active are also to be stated.

Question

Suppose a certain copolymer elastomeric material “styrene-butadiene rubber”) contains styrene ("S") monomers –(C8H8)– and butadiene ("B") monomers –(C4H6)– and that their numerical ratio S:B = 1:8. What is the mass ratio mS:mB of the two monomers in the material? What is the molecular mass M of a macromolecule of this copolymer with degree of polymerization n = 60,000? Data: AC = 12.01 u, AH = 1.008 u.

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Question

Chapter 10.SE, Problem 39AP

Interpretation Introduction

Interpretation:

Given that radical chlorination of (R)-2-chloropentane yields 2,4-dichloropentane in low yield. The number of stereoisomers formed, in what ratio and which of them are optically active are to be stated.

Concept introduction:

Whenever a new chiral centre is created in an optically active reactant in a reaction, diasteoisomers are produced. These diastereoisomers are usually obtained in unequal proportions as the approach of the reagent from backside is usually hindered. The diastereoisomers will be optically active if they are non superimposable on their mirror images and optically inactive if they are superimposable on their mirror images.

To state:

The number of stereoisomers formed in the reaction in which radical chlorination of (R)-2-chloropentane yields 2,4-dichloropentane in low yield. The ratio in which they are formed and which of them are optically active are also to be stated.

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